Some Trees' Leaves/Logs get cut off at chunk borders prior to world generation

Some trees grown at the time of the created world generation will apear cut off at or near chunk borders.

Edit by @unknown:
This affects giant mushrooms too. You can easily find those shrooms in swamps because they are more eye-catching than trees.

Steps to reproduce by @unknown:
Steps to reproduce in 1.1.0.0:
Load this Resource Pack that will display chunk boundaries.
Set render distance to 8 chunks.
Create a new infinite creative world with the seed Tree
Once spawned, you should be on a red line. Turn to face the sun (Note this is in 1.1.0.0) and fly up.
Now go towards the sun crossing 6 red lines below you (not counting the one you spawned on).
After passing 6 lines turn 90 deg to the right and pass 6 blue lines.
Turn right 90deg again and cross 6 red lines.
Turn right 90deg again and cross 12 blue lines.
Turn right 90deg once more and cross 11 red lines.
There should now be 2 birch trees to your right that have been cut off at the chunk boundry (shown in blue).

To compare, create a new world with the seed Tree again.
Cross you 11 red lines while facing the sun.
Turn left 90deg and cross 6 blue lines to see the same trees(now a little behind you) not cut off at the border.